The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 01, 2005
Filed:
Sep. 11, 2003
Peter Bauer, Ludwigshafen, DE;
Armin Lange, Heidelberg, DE;
Rainer Karer, Kaiserslautern, DE;
Philipp Rosendorfer, Neustadt, DE;
Manfred Hecker, Neustadt, DE;
Günther Schweier, Friedelsheim, DE;
Wolfgang Micklitz, Neustadt, DE;
Kaspar Evertz, Schifferstadt, DE;
Hans-jacob Feindt, Limburgerhof, DE;
Peter Bauer, Ludwigshafen, DE;
Armin Lange, Heidelberg, DE;
Rainer Karer, Kaiserslautern, DE;
Philipp Rosendorfer, Neustadt, DE;
Manfred Hecker, Neustadt, DE;
Günther Schweier, Friedelsheim, DE;
Wolfgang Micklitz, Neustadt, DE;
Kaspar Evertz, Schifferstadt, DE;
Hans-Jacob Feindt, Limburgerhof, DE;
Basell Polyolefine GmbH, Wesseling, DE;
Abstract
A continuous vapor-phase fluidized-bed process for the preparation of ethylene homopolymers and copolymers having a density of from 0.87 to 0.97 g/cmin which ethylene or mixtures of ethylene and C-Ca-monoolefins are (co)polymerized in the presence of a supported chromium catalyst in the polymerization zone of a vapor-phase fluidized-bed reactor under pressures ranging from 1 to 100 bar and at temperatures ranging from 30° to 125° C. in the vapor phase in an agitated bed of bulk material comprising particulate polymer, the resultant heat of polymerization is removed by cooling the recirculated reactor gas and the resulting (co)polymer is removed from the vapor-phase fluidized-bed reactor, wherein, for the preparation of a (co)polymer of a specific density d, the (co)polymerization is carried out at a temperature which is in a range restricted by an upper envelope defined by equation Iand a lower envelope defined by equation IIin which the variables have the following meanings: